Observational limits on MACHOS in the Galactic Halo.

Details Observational limits on MACHOS in the Galactic Halo. Observational limits on MACHOS in the Galactic Halo.

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...324l..69r&link_type=abstract

Astronomy and Astrophysics, v.324, p.L69-L72

Astronomy and Astrophysics

Astrophysics

77

Galaxy: Halo, Kinematics And Dynamics, Stellar Content, Cosmology: Dark Matter, Gravitational Lensing

Scientific paper

We present final results from the first phase of the EROS search for gravitational microlensing of stars in the Magellanic Clouds by unseen deflectors (machos: MAssive Compact Halo Objects). The search is sensitive to events with time scales between 15 minutes and 200 days corresponding to deflector masses in the range 10^-7^ to a few Msun_. Two events were observed that are compatible with microlensing by objects of mass =~ 0.1 Msun_. By comparing the results with the expected number of events for various models of the Galaxy, we conclude that machos in the mass range [ 10^-7^, 0.02] Msun_ make up less than 20 % (95 % C.L.) of the Halo dark matter.

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